A real conversation always contains an invitation. You are inviting another person to reveal herself or himself to you, to tell you who they are or what they want.
Actors are hard to photograph because they never want to reveal who they are. You don't know if you're getting a character from a Chekhov play or a Polanski film. It depends what mood they're in.
I do think people do pick movies that reveal something about them that they aren't always aware of. If you ask them what kind of an actor they think they are, they'll probably tell you something different than what they've actually done.
If you don't understand viruses, phishing, and similar threats, you become more susceptible to them. If you don't know how social networks leak information that you thought was private, you're likely to reveal much more than you realize.
Among the thousand-and-one faces whereby form chooses to reveal itself to us, the one that fascinates me more than any other, and continues to fascinate me, is the structure hidden in mathematical things.